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Swift 4 Programming Cookbook

You're reading from Swift 4 Programming Cookbook

Product type Book

Published in Sep 2017

Publisher Packt

ISBN-13 9781786460899

Pages 384 pages

Edition 1st Edition

Languages

Concepts

iOS Development

Table of Contents (9) Chapters

Preface

1. Swift Building Blocks

2. Building on the Building Blocks

3. Data Wrangling with Swift Control Flow

4. Generics, Operators, and Nested Types

5. Beyond the Standard Library

6. Swift Playgrounds

7. Server-Side Swift

8. Performance and Responsiveness in Swift

Bailing out with fatalError and precondition

It's comforting to think that, in the code you write, everything will always happen as expected, and your program can handle any eventuality. However, sometimes things can go wrong, really wrong; a situation can arise that you know is possible, but don't expect to ever happen, and the programs should terminate if it does. Swift has a way to define these situations, and in this recipe, we will look at two of them: fatalError and precondition.

Getting ready

Let's reuse our example from the previous recipe; we have an object that can be used to classify movie reviews based on how many stars out of ten the review gave the movie. However, let's simplify its use, and...

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